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Cytokines induced by immunization. Supernatants from HA-restimulated splenocytes from mice (C57BL/6, 5 per group) immunized for the experiment with results shown in Fig. 2 were analyzed by multiplex array for cytokines. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ns, not significant.
